Rule of four and two
Tried to search to see if this had been posted before but couldn't find anything so here goes.
Lots of threads on odds
and calculations so I thought I would pass on the easiest way to get your odds while playing. I learned this from my buddy Phil Gordon.
Simple as this: After the flop you times your number of outs by 4 and after the turn you times by 2. Pretty easy huh. So you have 8 outs after the flop, you have about a %32 chance to hit one of your cards and about a %16 after the turn The percentages are always a couple points lower than actual but are close enough and can easily be figured out on the fly.